Blend together mayo, buttermilk and next five ingredients. Pour 1 cup of dressing into a large ziplock back. Add chicken breasts. Seal and chill at least 30 minutes or overnight.

Preheat oven to 375. Discard marinade and place chicken breasts side by side in a shallow baking dish. Bake 20-25 minutes until chicken is cooked through. Top with additional dressing and serve with rice if desired. Enjoy!